www.pudn.com > spiht-0.3.rar > d2fldwt9_7.m

function dwt_img=d2fldwt9_7(img,level) 
% 
% dwt_img=d2fldwt9_7(img,level) 
% 
% The back lifting discrete 2-D wavelet transform (D2BLDWT) using the 9-7 Antonini filters  
% Contact me : swf000117@163.com,http://guohanwei.51.net,QQ:461414909  
 
 [x,y]=size(img); 
 dwt_img=img; 
 xx=x; 
 yy=y; 
 for i=1:level 
      
     for  k=1:xx 
         [app_sig,det_sig] = fldwt9_7(dwt_img(k,1:yy)); 
         dwt_img(k,1:yy)=[app_sig,det_sig]; 
     end 
      
     for l=1:yy 
         [app_sig,det_sig] = fldwt9_7(dwt_img(1:xx,l)); 
         dwt_img(1:xx,l)=[app_sig;det_sig]; 
     end 
     xx=xx/2; 
     yy=yy/2; 
 end